Ventilator



M. M NUTT Nov. 10 1925.

VENTILATOR Filed March 3. 1923 U Tl S E S MAXWELL MGNTTTT, OF SANFRANCISCO, CALIFGENIA.

VENTILATOR.

Application filed March 3, 1923. Serial No. 622,555.

To all whom it may concern:

Be it known that I, MAXWELL MCNUTT, a citizen of the United States, andresident of San Francisco, county of San Francisco, State of California,have invented a new and userul Improvement in Ventilators, of which thefollowing is a specification.

My invention has for its object means for ventilating rooms, buildings,holds of ships or other closed spaces, cars, automobiles, fines, etc.Other objects will appear from the drawings and specifications whichfollow.

My ventilator is characterized by a converging member having an enlargedinlet and a converging throat outlet portion, the large end beingdirectedto receive an in draft of air or the like, and within saidmember I mount a drafttube. This tube in passing through the wall of theconverging member is bent towards the throat and has its outlet in linewith the throat outlet and its inlet end opening into the space tobeventilated.

When my ventilator is to be employed outdoors it is advantageous tomount it rotatably on bearings and about a vertical axis.

By referring to the accompanying drawings my invention will be madeclear.

Fig. 1 is a cross section through my ventilator.

Fig. 2 is a rear end view of Fig. 1.

Throughout the figures similar numerals refer to identical parts.

A converging member is shown by the numeral 1 having an enlargedentrance portion at 2 and throat at 3 and an outlet from the said throatat 1. I prefer to make the cross section of this member circular as inthis way it can be readily spun or built up from. metal. At 5 is shown adraft tube bent as at 6 within the member 1 and having its outlet at 7in line with the outlet of the throat piece 4. The tube 5 mayconveniently form a support for the structure and is preferably beingmounted to rotate upon the ball bearing 8 carried on a stationary support 9 as on a building roof 10. The hearing is protected by the shield11.

The vertical axis of the tube 5 is preferably nearer the end 2 than thethroat end 4 and when the device is placed in an air current the vane 12will cause the inlet 2 to face the indraft which indraft I haveindicated by the arrows 13. The air flowing through the member 1 andespecially the converging throat 3 is increased in velocity as indicatedby the relative length of the arrows 14 compared with the arrows 13 andthereby estab lishes a partial vacuum at the outlet 7 of the tube 5. inthe tube from the room or space 15 and as indicated by the dotted arrows16. The said air flowing out of the tube 5 at its outlet 1 causes astrong outdraft from the space 15 and an'etlicient ventilation thereof.If the outlet- 7 is within the throat 3 the air flowing through thethroat will expand over said outlet reducing the volume drawn through 5,whereas if the tube end 7 is beyond the "throat outlet the air flowingfrom the throat will expand away from the tube outlet and reduce the airvolume drawn through 3.

For the best results therefore the outlet of the tube and the throatshould be substantially in the same plane.

At 18 is shown a valve normally open, but adapted to throttle or closethe opening at 17, should the draft become too great. The valve 18 ispivoted at 21 and partially counterbalanced by the weight 20 on the arm19. While this valve is shown as controlling the opening 17 it mayinstead be mounted within the throat or at the outlet 7 in the lattercase the pressure of the air at 14: may be caused to actuate a valve toclose the outlet 7.

I claim:

1. A ventilator comprising a converging member having a discharge throatand adapted to receive air flow in its large end, a tube having itsoutlet flush with the outlet of the said throat, said tube passingthrough the wall of said member and hav ing an inlet adapted to receiveair from a space to be ventilated.

2. A ventilator comprising a converging member having a discharge throatand adapted to receive air flow in its large end, a tube having itsoutlet flush with the outlet of the said throat, said tube passingthrough the wall of said member and having an inlet adapted to receiveair from a space to be ventilated, said inlet portion having bearingmeans whereby the ventilator may be turned in a horizontal plane.

3. A ventilator comprising a converging member having a discharge throatand adapted to receive air flow in its large end, a tube having itsoutlet flush with the outlet This causes air to flow upward of the saidthroat, said tube passing through the wall of said member and having aninlet adapted to receive air from a space to be ventilated, said inletportion having bearing means whereby the ventilator may be turned in ahorizontal plane and a vane on said member to turn said member towardssaid air pressure.

4. A ventilator as set forth in claim 1 wherein said member is ofcircular cross section and wherein said inlet axis is forward of thehorizontal center of said memher.

5. A ventilator as set'torth in claim 2 wherein said member is ofcircular cross section and wherein said inlet axis is torward of thehorizontal center of said member.

6. A ventilator as set forth in claim 3 wherein said member is ofcircular cross section and wherein said inlet axis is forward of thehorizontal center of said member.

7. A ventilator as set forth in claim 1 ,wherein the member and theoutlet portion of the tube have a common axis.

8. A ventilator as set forth in claim 2 wherein the member and theoutlet portion of the tube have a common axis.

9. A ventilator as set forth in claim 3 wherein the member and theoutlet portion of the tube have a common axis.

10. A ventilator as set forth in claim 1 wherein said member is ofcircular cross section and wherein said inlet axis is torward of thehorizontal center of said member and wherein the member and the outletportion of the tube have a common axis.

11. A ventilator as set forth in claim 2 wherein said member is ofcircular cross section and wherein said inlet axis is forward of thehorizontal center of said member and wherein the member and the outletportion of the tube have a common axis.

12. A ventilator as set forth in claim 3 wherein said member is ofcircular cross section and wherein said inlet axis is forward oi thehorizontal center of said mem her and wherein the member and the outletportion of the tube have a common axis.

MAXWELL McNUTT.

